Home / 30,943.80-42,719.94-21,397.68

Finding the Fourth Proportional to 30,943.80, 42,719.94 and 21,397.68

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Solution

The fourth proportional to 30,943.80, 42,719.94 and 21,397.68 is: 29,540.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,943.80 : 42,719.94 = 21,397.68 : x
  2. Step 2: Convert to fraction form
    30,943.80/42,719.94 = 21,397.68/x
  3. Step 3: Cross multiply
    30,943.80x = 42,719.94 × 21,397.68
  4. Step 4: Simplify right side
    30,943.80x = 914,107,605.74
  5. Step 5: Solve for x
    x = 914,107,605.74/30,943.80
  6. Step 6: Final answer
    x = 29,540.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.